Service-meter circuit for telephone-exchange systems.



S. B. WILLIAMS, JR. SERVIGE METER CIRCUIT FOR TELEPHONE EXCHANGE SYSTEMS.

APPLICATION FILED JULY 12, 1913.

1,1 19,915. Patented Dec. 8, 1914.

W/Ineases: hive/Var.- @2772 Samue/ 5. VV/Y/ifl/NJJ/f a? y MW HE NCRRIS PETERS 60.. PHOTO-LITIILL, wAbrllNu run. I) x SATHS PTNT C FICEE.

SAMUELB. WILLIAMS, JIL, 0F BROOKLYN, NEW' YORK, ASSIGNOR T0 WESTERN ELECTRIC COMPANY, OF NEW YORK, N. Y., A CORPORATION OF ILLINOIS.

SERVICE-METER CIRCUIT FOR TELEPHONE-EXCHANGE SYSTEMS.

Application filed July 12, 1913.

To all whom it may concern:

Be it known that I, SAMUEL B. l/VILLIAMs, Jr., a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Improvement in Service- Meter Circuits for Telephone-Exchange Systems, 01 which the following is a full, clear, concise, and exact description.

This invention relates to a service meter circuit for telephone exchange systems.

This invention has application particularly to systems of the automatic or semiautomatic type, but relates to apparatus which may be either wholly or partially manually controlled and it is therefore de scribed in connection with manually controlled apparatus.

It sometimes becomes important to distinguish between two classes of service, especially when connection is to be automatically established, by applying to the test, or other terminals of different lines, different characters or" current, such for example as from the positive and negative poles of a central battery.

The object of this invention is to provide circuits and apparatus for the proper operation of line service meters in systems of the above character. These service meters are preferably connected either in multiple or in series, with the usual line cut-oil relays, one terminal then being connected with the test terminal of the line, and the other terminal being connected either to the positive or the negative pole of the central battery. Service meters are preferably marginally actuated, that is they require the full potential of the battery over a circuit of comparatively low resistance, for their actuation.

This invention relates particularly to the means for automatically extending a low resistance circuit for the actuation of the service meter, to the opposite pole of battery from that to which the service meter is connected.

This invention is an improvement upon the invention of A. M. Bullard, patented August 9, 1910, No. 966,733.

The invention is illustrated in the accompanying drawing,in whichall apparatus is shown in its normal or unactuated condition, and in which only such parts of the Specification of Letters Patent.

Patented Dec. 8, 1914:. Serial No. 778,768.

system are illustrated, as will be helpful for tion.

Subscribers lines 1 and 2 are each provided with test contacts 3. The test contact of line 1 is connected through its cut-oil relay 4 in parallel with its service meter 5 to the negative pole of the central battery 6, while the test contact of line 2 is connected through its cut-oil relay 4- in parallel with its service meter 5 with the positive pole of central battery 6. The connecting circuit here shown is provided with a plug, but it may be provided with automatically movable contacts of a line finder switch if desired. The plug is provided with a con tact 7 adapted to register with the test contacts 3 of calling lines. Contact 7 is normally connected througl'i closed contacts of the service meter key 8, and the coil of relay 9, to the central point of battery 6, relay 9 being used for any purpose, such as to control cord circuit supervision. Service meter key 8 is provided with a pair of normally open contacts, one connected through the high resistance winding 10 of relay 11,

the coil 12 of meter 13, and contacts 14: of

relay 15, to the positive pole of battery 6. The other contact of the operators service meter key 8 is connected through the coil 16 of relay 15, winding 17 of position service meter 13 and the contacts-18 of relav 11 to the negative pole of battery 6. Relay 11 is provided with a low resistance winding 19, and a pair of normally open contacts 20 adapted, when relay is actuated, to include winding 19 in parallel with the high resistance winding 10. Relay 15 is provided with a low resistance winding 23, and normally open contacts 21, adapted to include winding 23 in parallel with the high resistgnce winding 16, when relay 15 is actuate In the operation of the system, when connection is made with the contacts of line 1, a circuit is first established from the negative pole of battery 6 through cut-off relay 4 and service meter 5, in parallel, contacts 3 and 17 of the jack and plug, normally closed contacts of the key 8 and the coil of relay 9 to the middle point of battery 6. Current in this path is insuflicient for the actuation of the service meter 5, but actuates relays 4 and 9, relay 4 serving the usual purpose of a cut-oil relay, and relay 9 serving any desired purpose in the connector circuit.

v'i'hen it has been finally determined that a call is to be registered, the key 8 is depressed, closing simultaneously the circuits of windings 1c and 16 of relays l1 and 15. By reason of the coil 16 of relay 15 being connected with the negative pole of battery c, this coil is now connected in parallel with cut-oft relay 1- and service meter 5, whereasv the coil 10 of relay 11 is connected in series not only with cutoli' relay 4: and service meter 0, but also with the coil 16 of relay 15; o'lhe current through the coil 10 of relay 11 is therefore so much greater than that through the coil 16 of relay 15, that the former is actuated, whereas the latter remains inert. Upon the actuation of relay 11, its. contacts 18 are interrupted, and its contacts 20 are closed. The former interrupt the circuit through the coil 16 of relay 15, and the latter close a low resistance path through winding 19 of relay 11. This low resistance path permits the flow of suflicient current from the positive pole of battery 6 through contacts 1 1 of relay 15, coil 12 of service meter magnet 15, winding 19 and contact 20 of relay 11, contacts 01 the now actuated service meter key 8, contacts 7 and 25 or the plug and jack and the coil of service meter 5 to the negative pole of battery 6 to actuate both the line service meter 5 and the position service meter 13; 7

If the connection had been established with line 2 instead of with line 1, relays 9 and 4 would have been initially actuated, and upon the operation of service meter key 8, relay 15 would have been actuated. .The circuit would then beclosed from the negative pole of battery through contacts 18 of relay 11, coil 1'? of service meter 13, coil 23 and contacts 21 of relay 15, contacts of the then actuated service meter key 8, contacts 7 and 3 of the plug and jack and the coil of the service meter 5 to the positive pole of battery. Current in this path would actuate the line service meter 5, and the position service meter 13.

It is to be understood that although this invention is snown and described in com bination with a telephone system, and for thepurpose of actuating a particular type of apparatus, via, service meters, it may be elsewhere used and applied to other types of apparatus without departing from the spirit or scope of the invention.

Claims:

1. In a telephone system, the combination with a plurality of telephone lines, each having a marginal service meter associated therewith, and a terminal to which potential is applied through such meter, of an operators connecting circuit for establishing connection with the terminal of any line,

nected with one pole'of said source, and a service meter for the other line connected with another pole of said source, a connecting circuit and means therein for complet' ing the circuit of either of said service meters, comprising a pair of relays connected in branch circuits, one of said relays being shunted by the service meter with which connection is established, the other of said relays being actuated to sever the circuit of the first relay. 7 j

8. In a telephone system, a service .meter, a circuit therefor, a source of current, a pair of branch circuits extending to opposite poles or" said source, a relay in each branch, a pair of normally closed contacts for each relay controlling the branch circuit through the other relay, one of said relays being actuated in operation of said service meter to open the circuit of the other relay.

1. In a telephone system, the COIIlblIlZL'.

tion with a source of current, of a pair, of electromagnets, one connected with one pole of said source and the other with another pole of said source, a pair 01:" relays, one having its coil connected with one pole of said source and the other with the other pole of said source, and means to simultaneously complete the circuits-of both ofsaid relays through either of said electromagnets, one of said relays being actuated and the other shunted when connection is completed through one of said electromagnets, and the latter of said relays being actuated and the former shunted when connection is'completed through the other of said electromagnets, and counter mechanism controlled by said electromagnets.

5. In a telephone system, the combination of a source of current, a pair of relays, the first having its winding connected through a contact of the second with the positive pole of said source, and the second having its winding connected through a normal contact of the first to the negative pole of said source, and means to connect the other terminals of each of said relays simultaneously with either pole of said source whereby one relay is energized and. the other shunted, and a low resistance path closed by the relay which is energized to cause an increased flow of current in the circuit, and an electromagnet included in said circuit and actuated by the increased flowof current.

6. In a service meter system, a source of current, a pair of relays connected to opposite poles of said source, a pair of service meter coils connected to opposite poles of said source and means to connect both said relays with either of said service meter coils, the first relay being shunted and the second actuated when connection is established with one of said service meters, and the second relay being shunted and the first actuated when connection is established with the other of said service meters.

7. The combination with a source of current, of a pair of electromagnetic devices, connected one to each pole of said source, a conductor, means for including said conductor in series with one of said electromagnetic devices and said source, and in shunt of the other of said electromagnetic devices, and means controlled by the electromagnet in the series circuit for opening the shunt circuit.

8. In a telephone system, the combination with a plurality of telephone lines, each having a marginal service meter, of a connecting circuit for establishing connection with said line and its associated meter, sources of current of different polarity associated with the connecting circuit, means for applying said source to operate the service meter of the line to which connection has been made, and non-polarized relay apparatus adapted automatically to se lect the source of current to be applied by said means.

9. The combination with a source of current, of a pair of electromagnetic devices, connected one to each pole of said source, a conductor, means for including said conductor in series with either of said electromagnets and said source, and in shunt of the other of said electromagnets, and means under the control of the electromagnet included in the series circuit for opening the circuit of the electromagnet included in the shunt circuit.

10. The combination With a source of current, of a pair of electromagnetic devices, connected one to each pole of said source, a conductor, and means for including said conductor temporarily in series with either of said electomagnets and said source, and in shunt of the other of said electromagnets.

In Witness whereof, I hereunto subscribe my name vthis 10th day of July A. D., 1913.

ALICE HAZLEY, LAURA Donmo.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents,

Washington, 10.0." 

